The manufacture of a coating for cloths for aeroplane wings or planes and the like



Patented Oct. 9, 1923.

UNITED STATES PATENT OFFICE.

KIYOSHI KAWASHIMA, OF MITSUGI-GUN, .J'APAN.

THE MANUFACTURE OF A COATING FQR CLOTHS FOR AEBOPLANE WINGS AND THE LIKE.

No Drawing.

To all whom it may concern: I

Be it known that I, KIYOSHI-KAWASHIMA,

a subject of the Emperor of J a an, residing at No. 364 Mihara-machi, itsugi-gun, Hiroshima-ken, in the Empire of Japan, have invented certain new and useful Improvements in the Manufacture of a Coating for Cloths for Aeroplane Wings orPlanes and the like, of which the following is a- Another object of the invention is to increase the weather-proof quality of the wing-cloths, and to maintain the desired durability, extensibility and resiliency of the wing-covering enabling it to maintain the same always in their stretched condition regardless of changes of temperatures and moistures.

According to this invention, the abovementioned objects in view, suitable quantity of nitrocellulose is first treated with an aqueous solution of ric acid or withv an aqueous solutionof boric acid and hydrogen peroxide, and then it is dissolved in acetone, and then boric acid and magnesium chloride are dissolved in the same, and the resulting solution may be used as a weather-proofing coating.

-In carrying out the invention into practies, the process is divided into two stages. In the first stage, nitrocellulose is denitrated to a suitable extent by'tre'ating it Withan aqueous solution of boric acid; The soluon PLANES Application filed Decemberll, 1922. Serial No. 606,258.

Water l 100 Boric acid 10-15 In another case, nitrocellulose may be treated with an aqueous solution of boric acid and hydrogen peroxide, its proportion 'bein g as follows Water 100 Boric acid 510 Hydrogen peroxide 510 The nitrocellulose is treated with said solution for, for example, three hours, and then it is washed with clean water and dried.

In the second stage, the nitrocellulose thus treated is dissolved in acetone in the usual manner, and then boric acid and magnesium chloride are dissolved in the same in the following proportion I Nitrocellulose solution 100 Boric acid 10-15 Magnesium chloride 10-15 I The solutiom produced by the foregoing process may be used as a weather-proofing material and may be applied to cloths for the wings or planes of aero lanes and the like, and the coating sticks firmly to cloths and is not liable to exfoliate by the vibration of. the wings or planes of aero lanes, and yet the desired extensibility an of the cloths may be maintained. The win cloths may be maintained always in their stretched condition. By experiments, it has been found that the coated surfaces of aeroplane wings o'r planes are not damaged at any temperature of less than 200 C.

v What I claim is g 1. A method of producing a coating material for cloths for aeroplane wings or planes and the like, which consists in treating nitrocellulose with an a ueous solution of boric acid, and then disso ving said treated nitroresiliency cellulose in acetone; and then dissolving boric acid and magnesium chloride in the same.

2. A method of producing a coating material for cloths for aeroplane Wings or planes and the like which consists in treating nitrocellulose With an aqueous solution of boric acid and hydrogen peroxide, and then lissolving said treated nitrocellulose in acetone,

i eeogeso and then dissolving boric acid and magnesium chloride in the same.

3. A coating for cloths for aeroplane wings or planes and the like, which is made from denitrated nitrocellulose, acetone, boric acid and magnesium chloride.

In testimony whereof I afiix my Signature.

KIYOSHI KAWASHIMA. 

